'Game of Thrones' season 4 trailer teases

HBO has posted a little tiny teases of its hotly anticipated Game of Thrones season 4 trailer. The quickie Vines shows Jon Snow in full battle-rage — possibly defending Castle Black against the Wildlings? — Tyrion in chains, and more. All high action! The full trailer will be posted Sunday night, with Thronesreturning to HBO on April 6.